In the 1800s, scientists began noticing that some continents fit together like the pieces of a jigsaw puzzle. This led to speculations that the continents were once connected, but moved apart. Evid...
A region’s geological activity is often determined by the different plate boundaries below that region. Divergent boundaries occur when plates are moving away from each other. These regions are kno...
Much like a peach, Earth is divided into layers. The thinnest layer is the crust, which composes all the continents and ocean basins. The crust is divided into several massive tectonic plates. Bene...
Density is a measure of how much mass is packed into a given volume. This is determined by the mass and number of particles occupying a given space. The relative density of a substance may be used ...
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A mixture is a physical combination of two or more different substances. Mixtures can always be separated into t...
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Properties are characteristics that help identify a substance. Physical properties may be observed or measured without changing the identity of the substance, s...
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Physical properties like luster, malleability, and ductility help distinguish the 118 building bl...
Matter is anything that occupies mass and takes up space. Matter is made of particles, which have kinetic energy—they are in constant movement. There are three states of matter: solids, liquids, an...
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Light behaves in surprising ways—it can act like both a wave and a particle. The double slit experiment...
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AP Physics 1 is an algebra-based, introductory...
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Through experiment, we can uncover the relationship be...
At CERN’s Large Hadron Collider, high-energy beams collide in our giant detectors, generating vast amounts of data. This data is visualized through event displays.
To create these displays, experi...
What are the four fundamental forces of nature?
We celebrate 100 years since the birth of ICTP founder and Nobel laureate
Prof. Abdus Salam by asking our High Energy Physics diploma students about his work and legacy.
ICTP Postgraduate Diploma
...
What are the four fundamental forces of nature?
We celebrate 100 years since the birth of ICTP founder and Nobel laureate
Prof. Abdus Salam by asking our High Energy Physics diploma students about his work and legacy.
ICTP Postgraduate Diploma
...
Speakers
Gerbrand Ceder
Distinguished Professor in Materials Science and Engineering, University of California, Berkeley
Kristin Persson
Daniel M. Tellep Distinguished Professor in Engineering, D...
...periodic table organizes elements by atomic number, revealing patterns in their physical and chemical properties. Elements are categorized as metals, nonmetals, or metalloids ba...
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Linear momentum is conserved in all interactio...
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Earth’s atmosphere, geosphere, hydrosphere, and biosphere work together to shape every place on the pl...
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! https://www.khanacademy.org/science/ap-college-physics-1
Energy is conserved in all interactions. Any c...